1. Assistant Professor, Dept. of Transportation Planning and Engineering, National Technical Univ. of Athens, 5, Iroon Polytechniou Str., GR-15773 Athens, Greece.
2. Professor, Dept. of Transportation Planning and Engineering, National Technical Univ. of Athens, 5, Iroon Polytechniou Str., GR-15773 Athens, Greece.
3. Research Assistant, Dept. of Transportation Planning and Engineering, National Technical Univ. of Athens, 5, Iroon Polytechniou Str., GR-15773 Athens, Greece.